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    • 61. 发明授权
    • Keyboard etching apparatus
    • 键盘蚀刻装置
    • US6051098A
    • 2000-04-18
    • US916923
    • 1997-08-22
    • Kevin Lee
    • Kevin Lee
    • B23K26/08B23K26/14C23F1/02
    • B23K26/0838B23K26/142B23K26/1462H01H2009/187
    • A keyboard etching apparatus includes a base on which a frame is fixed to support a laser beam source and a keyboard tray thereon to be spaced from each other in such a manner to allow a laser beam emitted from the laser beam source to project onto a keyboard removably supported on the keyboard tray for performing etching operation on the keyboard. A keyboard supply cart having a plurality of non-etched keyboards held therein and a keyboard collecting cart for collecting etched keyboards are respectively arranged on two opposite sides of the frame and movable along rails fixed on the base. A conveyor system is arranged between the keyboard supply cart and the keyboard collecting cart for sequentially moving each of the non-etched keyboards received in the keyboard supply cart to the keyboard tray to be etched by the laser beam and to simultaneously move the etched keyboard from the keyboard tray to the keyboard collecting cart to be collected therein.
    • 键盘蚀刻装置包括:基座,其上固定框架以支撑激光束源和键盘托盘,以便彼此间隔开,从而允许从激光束源发射的激光束投射到键盘上 可拆卸地支撑在键盘盘上,用于在键盘上进行蚀刻操作。 键盘供给车具有多个未被蚀刻的键盘和一个用于收集蚀刻键盘的键盘收集车,分别设置在框架的两个相对的两侧,并可沿着固定在基座上的导轨移动。 输送机系统布置在键盘供应车和键盘收集车之间,用于将接收在键盘供应车中的每个未蚀刻的键盘顺序地移动到要由激光束蚀刻的键盘托盘,并同时将蚀刻的键盘从 键盘托盘到键盘收集车收集在其中。
    • 70. 发明申请
    • SYSTEM AND METHOD FOR FAST START-UP OF AN INDUCTION MOTOR
    • 用于电动机快速启动的系统和方法
    • US20120256580A1
    • 2012-10-11
    • US13083849
    • 2011-04-11
    • Anbo YuLei ZhangKevin Lee
    • Anbo YuLei ZhangKevin Lee
    • H02P1/30
    • H02P1/28H02P29/032
    • A system for controlling operation of a motor drive during fast start-up of an induction motor is disclosed. The system includes an AC motor drive having a PWM inverter and a control system to generate a command signal to cause the PWM inverter to control an output of the AC motor drive. The control system includes a start-up modulator that is selectively operable during start-up acceleration of the AC motor, the start-up modulator programmed to determine a motor current applied to the AC motor and a voltage of a DC bus, generate a first frequency offset that causes a frequency reference of the command signal to be decreased when the motor current is greater than a reference current threshold, and generate a second frequency offset that causes the frequency reference of the command signal to be increased when the DC bus voltage is greater than a reference voltage threshold.
    • 公开了一种用于在感应电动机的快速启动期间控制电动机驱动器的操作的系统。 该系统包括具有PWM逆变器的AC电动机驱动器和用于产生指令信号以使PWM逆变器控制AC电动机驱动器的输出的控制系统。 控制系统包括启动调制器,其可在AC电动机的启动加速期间选择性地工作,所述启动调制器被编程以确定施加到AC电动机的电动机电流和DC总线的电压,产生第一 当电动机电流大于参考电流阈值时,导致指令信号的频率参考值减小的频率偏移,并且产生第二频率偏移,当DC总线电压为直流母线电压时,产生使指令信号的频率参考值增加的第二频率偏移 大于参考电压阈值。